CN109468477A - A kind of welding production method of aluminium alloy sheet plate - Google Patents
A kind of welding production method of aluminium alloy sheet plate Download PDFInfo
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- CN109468477A CN109468477A CN201811319534.5A CN201811319534A CN109468477A CN 109468477 A CN109468477 A CN 109468477A CN 201811319534 A CN201811319534 A CN 201811319534A CN 109468477 A CN109468477 A CN 109468477A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
Abstract
A kind of welding production method of aluminium alloy sheet plate, is related to a kind of production method of aluminum alloy plate materials.Purpose is edge crack in the aluminum alloy piping welding performance difference and the operation of rolling for solve the problems, such as 0 state of welding.Method: it weighs melting raw material and is prepared into aluminium alloy solution, founding obtains aluminium alloy cast ingot, aluminium alloy cast ingot carries out carrying out milling flat processing and heating, then hot rolling obtains rerolling quality, cold rolling obtains semi-finished product band, then it anneals, design thickness is cold-rolled to after annealing, finally finished product band is annealed.Sodium salt degeneration agent is added when the present invention is cast and has carried out finished products, casting, hot rolling, cold rolling, intermediate annealing, cold rolling and annealing process are passed sequentially through in preparation process, solve the problems, such as that edge crack and composition are unevenly distributed the problem of causing welding process that desoldering occurs in the operation of rolling, improve welding performance.The present invention is suitable for preparing aluminium alloy sheet plate.
Description
Technical field
The present invention relates to a kind of production methods of aluminum alloy plate materials.
Background technique
The aluminium alloy of existing welding O state has moderate strength, good corrosion resistance, wearability, fusing point low, good
Welding performance and easy processing shape the features such as, be the exemplary alloy in Al-Si alloy.The aluminum alloy plate materials of O state are current
By extensively should be in fields such as welding materials.There are sides in operation of rolling plate for the production technology of welding O state thin plate plate at present
The problem that portion cracks and welding performance is bad.Edge temperature is too low when plate hot rolling in existing production technology or composition segregation causes
The generation of pile displacement can all cause sheet material edge in the operation of rolling to crack, and plate composition, which is unevenly distributed, to be easy to cause in welding process
Desoldering occurs, therefore there is a problem of welding performance difference.
Summary of the invention
Edge crack in aluminum alloy piping welding performance difference and the operation of rolling of the present invention in order to solve 0 state of existing welding
Problem provides a kind of production method of welding aluminium alloy sheet plate.
The present invention is welded to be followed the steps below with the production method of aluminium alloy sheet plate:
It one, is by weight percentage Si:11.5~12%, Mn:0.05~0.1%, Zn:0.1~0.15%, Ti:0.01
~0.03% and surplus be Al weigh aluminium silicon intermediate alloy, aluminium manganese intermediate alloy, aluminium zinc intermediate alloy, aluminium titanium intermediate alloy and gold
Belong to aluminium as melting raw material, melting raw material is prepared into aluminium alloy solution；Wherein impurity includes Mg, Fe and Cu, Mg weight percent
Than less than 0.1%, Fe weight percent less than 0.25%, Cu weight percent less than 0.02%；
Smelting temperature in the preparation process of aluminium alloy solution described in step 1 is 680~720 DEG C；
Two, sodium salt degeneration agent is added into the aluminium alloy solution that step 1 obtains, carries out founding and obtains aluminium alloy cast ingot；
The aluminium alloy solution carries out using semi-continuous casting method when founding, and casting temperature is 680~720 DEG C, founding speed
Degree be 55~60mm/min, casting cooling water pressure be 0.008~0.15MPa, 20~26 DEG C of cooling water temperature；
The mass fraction of sodium salt degeneration agent is 0.09~0.11% in the aluminium alloy solution；
The sodium salt degeneration agent is by mass fraction by 74~76% NaC and Na of surplus3AlF6It mixes；It prepared
Salt alterant can refine crystal grain in journey；
Three, aluminium alloy cast ingot is subjected to milling flat processing；
Four, three milling flat of heating stepses treated aluminium alloy cast ingot, be then transferred on hot-rolling mill be hot-rolled down to a thickness of
5.9~6.1mm obtains rerolling quality；
The heating process of the aluminium alloy cast ingot are as follows: aluminium alloy cast ingot is placed in 560~580 DEG C of heating furnace and is kept the temperature
Then furnace temp is adjusted to 470~490 DEG C and keeps the temperature 6~8h by 4~5h；
The hot-rolled temperature is 470~480 DEG C；
Five, rerolling quality is placed on cold-rolling mill and is rolling to a thickness of 2.9~3.1mm, obtain semi-finished product band；
Pass reduction is 25~35% in the operation of rolling,
Six, semi-finished product band is put into annealing furnace to anneal, is then come out of the stove air-cooled, the semi-finished product band after being annealed
Material；
The annealing process are as follows: semi-finished product band is placed in annealing furnace annealing 15~20 hours of 300~450 DEG C, so
Annealing furnace temperature is adjusted to 410~430 DEG C afterwards and keeps the temperature 1~2 hour；
Seven, the semi-finished product band after annealing be cold-rolled to finished article design thickness, when cold rolling pass reduction be 25~
35%, obtain finished product band；
Eight, finished product band is put into annealing furnace and is annealed, obtain welding aluminum alloy plate materials semi-finished product；It finally will weldering
It connects and is sheared with aluminum alloy plate materials semi-finished product, that is, complete；
The annealing process of the finished product band are as follows: first finished product band be placed in 120~180 DEG C annealing furnace annealing 5~
Then annealing furnace temperature is adjusted to 135~145 DEG C and keeps the temperature 1.5~2.5 hours by 7h.
It the principle of the invention and has the beneficial effect that
Sodium salt degeneration agent is added when the present invention is cast and has carried out finished products, casting, heat are passed sequentially through in preparation process
It rolls, cold rolling, intermediate annealing, cold rolling and annealing process, has obtained the welding aluminium alloy sheet plate of stable product quality, produced
Simple process；It is 198~202N/mm that the present invention, which is welded with the tensile strength of aluminium alloy sheet plate,2, yield strength be 176~
180N/mm2, elongation percentage is 3~6%；The present invention is added by sodium salt degeneration agent can refine crystal grain, prevent the generation of pile displacement,
Solves the problems, such as edge crack in the operation of rolling；The plate even tissue obtained at being 120~180 DEG C in annealing temperature, solution
Plate composition of having determined is unevenly distributed the problem of causing welding process that desoldering occurs, and improves welding performance.
Detailed description of the invention
Fig. 1 is the mirco structure photo of the finished product band obtained after 2 cold rolling of embodiment；
Fig. 2 is the mirco structure photo for the welding aluminum alloy plate materials that embodiment 1 obtains；
Fig. 3 is the mirco structure photo for the welding aluminum alloy plate materials that embodiment 2 obtains；
Fig. 4 is the mirco structure photo for the welding aluminum alloy plate materials that embodiment 3 obtains；
Fig. 5 is the mirco structure photo for the welding aluminum alloy plate materials that embodiment 4 obtains.
Specific embodiment:
The technical solution of the present invention is not limited to the following list, further includes between each specific embodiment
Any reasonable combination.
Specific embodiment 1: the production method of present embodiment welding aluminium alloy sheet plate according to the following steps into
Row:
It one, is by weight percentage Si:11.5~12%, Mn:0.05~0.1%, Zn:0.1~0.15%, Ti:0.01
~0.03% and surplus be Al weigh aluminium silicon intermediate alloy, aluminium manganese intermediate alloy, aluminium zinc intermediate alloy, aluminium titanium intermediate alloy and gold
Belong to aluminium as melting raw material, melting raw material is prepared into aluminium alloy solution；
Two, sodium salt degeneration agent is added into the aluminium alloy solution that step 1 obtains, carries out founding and obtains aluminium alloy cast ingot；
The sodium salt degeneration agent is by mass fraction by 74~76% NaC and Na of surplus3AlF6It mixes；
Three, aluminium alloy cast ingot is subjected to milling flat processing；
Four, three milling flat of heating stepses treated aluminium alloy cast ingot, be then transferred on hot-rolling mill be hot-rolled down to a thickness of
5.9~6.1mm obtains rerolling quality；
The heating process of the aluminium alloy cast ingot are as follows: aluminium alloy cast ingot is placed in 560~580 DEG C of heating furnace and is kept the temperature
Then furnace temp is adjusted to 470~490 DEG C and keeps the temperature 6~8h by 4~5h；
Five, rerolling quality is placed on cold-rolling mill and is rolling to a thickness of 2.9~3.1mm, obtain semi-finished product band；
Six, semi-finished product band is put into annealing furnace to anneal, is then come out of the stove air-cooled, the semi-finished product band after being annealed
Material；
Seven, the semi-finished product band after annealing be cold-rolled to finished article design thickness, when cold rolling pass reduction be 25~
35%, obtain finished product band；
Eight, finished product band is put into annealing furnace and is annealed, obtain welding aluminum alloy plate materials semi-finished product；It finally will weldering
It connects and is sheared with aluminum alloy plate materials semi-finished product, that is, complete；
The annealing process of the finished product band are as follows: first finished product band be placed in 120~180 DEG C annealing furnace annealing 5~
Then annealing furnace temperature is adjusted to 135~145 DEG C and keeps the temperature 1.5~2.5 hours by 7h.
It present embodiment principle and has the beneficial effect that
Sodium salt degeneration agent is added when present embodiment is cast and has carried out finished products, casting is passed sequentially through in preparation process
It makes, hot rolling, cold rolling, intermediate annealing, cold rolling and annealing process, has obtained the welding aluminium alloy sheet plate of stable product quality
Material, simple production process；The tensile strength of present embodiment welding aluminium alloy sheet plate is 198~202N/mm2, surrender
Intensity is 176~180N/mm2, elongation percentage is 3~6%；Present embodiment is added by sodium salt degeneration agent can refine crystal grain, prevent
The only generation of pile displacement solves the problems, such as edge crack in the operation of rolling；It is obtained at being 120~180 DEG C in annealing temperature
Plate even tissue, solving the problems, such as that plate composition is unevenly distributed causes welding process that desoldering occurs, and improves welding performance.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: aluminium alloy described in step 1 is molten
Smelting temperature in the preparation process of liquid is 680~720 DEG C.Other steps and parameter are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: aluminium described in step 2 closes
Gold solution carries out using semi-continuous casting method when founding, and casting temperature is 680~720 DEG C, and melting casting rate is 55~60mm/min,
Casting cooling water pressure be 0.008~0.15MPa, 20~26 DEG C of cooling water temperature.Other steps and parameter and specific embodiment
One or two is identical.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: described in step 2
The mass fraction of sodium salt degeneration agent is 0.09~0.11% in aluminium alloy solution.Other steps and parameter and specific embodiment one
It is identical to one of three.
Specific embodiment 5: unlike one of present embodiment and specific embodiment one to four: described in step 4
Hot-rolled temperature is 470~480 DEG C.Other steps and parameter are identical as one of specific embodiment one to four.
Specific embodiment 6: unlike one of present embodiment and specific embodiment one to five: described in step 5
Pass reduction is 25~35% in the operation of rolling.Other steps and parameter are identical as one of specific embodiment one to five.
Specific embodiment 7: unlike one of present embodiment and specific embodiment one to six: described in step 6
Annealing process are as follows: be placed in semi-finished product band annealing furnace annealing 15~20 hours of 300~450 DEG C, then will anneal furnace temperature
Degree is adjusted to 410~430 DEG C and keeps the temperature 1~2 hour.Other steps and parameter are identical as one of specific embodiment one to six.
Beneficial effects of the present invention are verified using following embodiment:
Embodiment 1:
The present embodiment welding is followed the steps below with the production method of aluminium alloy sheet plate:
One, be by weight percentage Si:11.6%, Mn:0.06%, Zn:0.12%, Ti:0.02% and surplus is that Al claims
Take aluminium silicon intermediate alloy, aluminium manganese intermediate alloy, aluminium zinc intermediate alloy, aluminium titanium intermediate alloy and metallic aluminium as melting raw material, it will
Melting raw material is prepared into aluminium alloy solution；
Smelting temperature in the preparation process of the aluminium alloy solution is 700 DEG C；
Two, sodium salt degeneration agent is added into the aluminium alloy solution that step 1 obtains, carries out founding and obtains aluminium alloy cast ingot；Institute
State aluminium alloy cast ingot with a thickness of 520mm；
The aluminium alloy solution carries out using semi-continuous casting method when founding, and casting temperature is 700 DEG C, and melting casting rate is
57mm/min, casting cooling water pressure be 0.008MPa, 23 DEG C of cooling water temperature；
The mass fraction of sodium salt degeneration agent is 0.1% in the aluminium alloy solution；
The sodium salt degeneration agent is by mass fraction by the 75% NaC and Na of surplus3AlF6It mixes；
Three, aluminium alloy cast ingot is subjected to milling flat processing；
Four, three milling flat of heating stepses treated aluminium alloy cast ingot, be then transferred on hot-rolling mill be hot-rolled down to a thickness of
5.9~6.1mm obtains rerolling quality；
The heating process of the aluminium alloy cast ingot are as follows: aluminium alloy cast ingot is placed in in 570 DEG C of heating furnace and is kept the temperature 4.5h,
Then furnace temp is adjusted to 480 DEG C and keeps the temperature 7h；
The hot-rolled temperature is 475 DEG C；
The milling flat treated aluminium alloy cast ingot with a thickness of 500mm；
Five, rerolling quality is placed on cold-rolling mill and is rolling to a thickness of 3mm, pass reduction is in the operation of rolling
30%, obtain semi-finished product band；
Six, semi-finished product band is put into annealing furnace to anneal, is then come out of the stove air-cooled, the semi-finished product band after being annealed
Material；
The annealing process are as follows: be placed in semi-finished product band annealing furnace annealing 18 hours of 400 DEG C, then by annealing furnace
Temperature is adjusted to 420 DEG C and keeps the temperature 2 hours；
Seven, the semi-finished product band after annealing be cold-rolled to 1mm, pass reduction is 30% when cold rolling, obtains finished product
Band；
Eight, finished product band is put into annealing furnace and is annealed, obtain welding aluminum alloy plate materials semi-finished product；It finally will weldering
It connects and is sheared with aluminum alloy plate materials semi-finished product, that is, complete.The annealing process of the finished product band are as follows: finished product band first is placed in
Then annealing furnace temperature is adjusted to 140 DEG C and keeps the temperature 2 hours by 120 DEG C of annealing furnace annealing 6h.
The present embodiment welding is 195N/mm2, yield strength 175N/mm2 with the tensile strength of aluminium alloy sheet plate,
Elongation percentage is 5.3%.The present embodiment is added by sodium salt degeneration agent can refine crystal grain, prevent the generation of pile displacement, solve and roll
During system the problem of edge crack；The plate even tissue obtained at being 120 DEG C in annealing temperature, solves plate composition point
The problem of cloth unevenness causes welding process that desoldering occurs, improve welding performance.
Embodiment 2: the present embodiment unlike the first embodiment, the annealing process of the finished product band are as follows: completed belt first
Material is placed in 140 DEG C of annealing furnace annealing 6h, and annealing furnace temperature is then adjusted to 140 DEG C and keeps the temperature 2 hours；Other steps and
Technique is same as Example 1；
The present embodiment welding is 202N/mm with the tensile strength of aluminium alloy sheet plate2, yield strength 180N/mm2, prolong
Stretching rate is 6%.The present embodiment is added by sodium salt degeneration agent can refine crystal grain, prevent the generation of pile displacement, solve and rolled
In journey the problem of edge crack；The plate even tissue obtained at being 140 DEG C in annealing temperature, solves the distribution of plate composition not
The problem of causing welding process that desoldering occurs, improve welding performance.
Embodiment 3: the present embodiment unlike the first embodiment, the annealing process of the finished product band are as follows: completed belt first
Material is placed in 160 DEG C of annealing furnace annealing 6h, and annealing furnace temperature is then adjusted to 140 DEG C and keeps the temperature 2 hours；Other steps and
Technique is same as Example 1.The present embodiment welding is 200N/mm with the tensile strength of aluminium alloy sheet plate2, yield strength is
175N/mm2, elongation percentage 5.5%.The present embodiment is added by sodium salt degeneration agent can refine crystal grain, prevent the generation of pile displacement,
Solves the problems, such as edge crack in the operation of rolling；The plate even tissue obtained at being 160 DEG C in annealing temperature, solves plate
Material composition is unevenly distributed the problem of causing welding process that desoldering occurs, and improves welding performance.
Embodiment 4: the present embodiment unlike the first embodiment, the annealing process of the finished product band are as follows: completed belt first
Material is placed in 180 DEG C of annealing furnace annealing 6h, and annealing furnace temperature is then adjusted to 140 DEG C and keeps the temperature 2 hours；Other steps and
Technique is same as Example 1.The present embodiment welding is 201N/mm with the tensile strength of aluminium alloy sheet plate2, yield strength is
179N/mm2, elongation percentage 5.9%.The present embodiment is added by sodium salt degeneration agent can refine crystal grain, prevent the generation of pile displacement,
Solves the problems, such as edge crack in the operation of rolling；The plate even tissue obtained at being 180 DEG C in annealing temperature, solves plate
Material composition is unevenly distributed the problem of causing welding process that desoldering occurs, and improves welding performance.
Obtain the mirco structure photo of the finished product band obtained after 2 cold rolling of embodiment；As shown in Figure 1；Acquisition embodiment 1~
The mirco structure photo of 4 obtained welding aluminum alloy plate materials；As shown in Figure 2-5；Fig. 2 is the welding aluminium that embodiment 1 obtains
The mirco structure photo of sheet alloy；Fig. 3 is the mirco structure photo for the welding aluminum alloy plate materials that embodiment 2 obtains；Fig. 4 is
The mirco structure photo for the welding aluminum alloy plate materials that embodiment 3 obtains；Fig. 5 is the welding aluminium alloy plate that embodiment 4 obtains
The mirco structure photo of material；It is compared by Fig. 1~5 it is found that after having carried out finished products, the structural state of plate is all obvious
An improvement is obtained, the Tissue distribution for the welding aluminum alloy plate materials that embodiment 2 obtains is uniform, is better than embodiment 1,3 and of embodiment
Embodiment 4, therefore mechanical property and welding performance are also superior to embodiment 1, embodiment 3 and embodiment 4.
Claims (7)
1. the production method that aluminium alloy sheet plate is used in a kind of welding, it is characterised in that: this method follows the steps below:
One, by weight percentage for Si:11.5~12%, Mn:0.05~0.1%, Zn:0.1~0.15%, Ti:0.01~
0.03% and surplus be Al weigh aluminium silicon intermediate alloy, aluminium manganese intermediate alloy, aluminium zinc intermediate alloy, aluminium titanium intermediate alloy and metal
Aluminium is prepared into aluminium alloy solution as melting raw material, by melting raw material；
Two, sodium salt degeneration agent is added into the aluminium alloy solution that step 1 obtains, carries out founding and obtains aluminium alloy cast ingot；
The sodium salt degeneration agent is by mass fraction by 74~76% NaC and Na of surplus3AlF6It mixes；
Three, aluminium alloy cast ingot is subjected to milling flat processing；
Four, three milling flat of heating stepses treated aluminium alloy cast ingot, be then transferred on hot-rolling mill be hot-rolled down to a thickness of 5.9~
6.1mm obtains rerolling quality；
The heating process of the aluminium alloy cast ingot are as follows: aluminium alloy cast ingot is placed in 560~580 DEG C of heating furnace and keep the temperature 4~
Then furnace temp is adjusted to 470~490 DEG C and keeps the temperature 6~8h by 5h；
Five, rerolling quality is placed on cold-rolling mill and is rolling to a thickness of 2.9~3.1mm, obtain semi-finished product band；
Six, semi-finished product band is put into annealing furnace to anneal, is then come out of the stove air-cooled, the semi-finished product band after being annealed；
Seven, the semi-finished product band after annealing be cold-rolled to finished article design thickness, pass reduction is 25~35% when cold rolling,
Obtain finished product band；
Eight, finished product band is put into annealing furnace and is annealed, obtain welding aluminum alloy plate materials semi-finished product；Finally welding is used
Aluminum alloy plate materials semi-finished product are sheared, that is, are completed；
The annealing process of the finished product band are as follows: finished product band is placed in 120~180 DEG C of annealing 5~7h of furnace annealing first, so
Annealing furnace temperature is adjusted to 135~145 DEG C afterwards and keeps the temperature 1.5~2.5 hours.
2. the production method that aluminium alloy sheet plate is used in welding according to claim 1, it is characterised in that: described in step 1
Smelting temperature in the preparation process of aluminium alloy solution is 680~720 DEG C.
3. the production method that aluminium alloy sheet plate is used in welding according to claim 1 or 2, it is characterised in that: step 2
The aluminium alloy solution carries out using semi-continuous casting method when founding, and casting temperature is 680~720 DEG C, and melting casting rate is 55~
60mm/min, casting cooling water pressure be 0.008~0.15MPa, 20~26 DEG C of cooling water temperature.
4. the production method that aluminium alloy sheet plate is used in welding according to claim 3, it is characterised in that: described in step 2
The mass fraction of sodium salt degeneration agent is 0.09~0.11% in aluminium alloy solution.
5. the production method that aluminium alloy sheet plate is used in welding according to claim 1,2 or 4, it is characterised in that: step
Four hot-rolled temperatures are 470~480 DEG C.
6. the production method that aluminium alloy sheet plate is used in welding according to claim 5, it is characterised in that: described in step 5
Pass reduction is 25~35% in the operation of rolling.
7. the production method that aluminium alloy sheet plate is used in welding according to claim 6, it is characterised in that: described in step 6
Annealing process are as follows: be placed in semi-finished product band annealing furnace annealing 15~20 hours of 300~450 DEG C, then will anneal furnace temperature
Degree is adjusted to 410~430 DEG C and keeps the temperature 1~2 hour.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112207146A (en) * | 2020-10-29 | 2021-01-12 | 大力神铝业股份有限公司 | Preparation method of aluminum alloy plate |
| CN113458732A (en) * | 2021-07-12 | 2021-10-01 | 中南大学 | Preparation process of aluminum-silicon alloy for improving laser welding performance |
| CN114182142A (en) * | 2021-12-09 | 2022-03-15 | 东北轻合金有限责任公司 | Al-Si-Cu-Mg-Mn die-casting aluminum alloy and preparation method thereof |
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